\documentclass{article}
\usepackage{amssymb,amsmath,amscd,concmath}
\pagestyle{empty}
\begin{document}
\begin{equation*}
\frac{1}{2} = \frac{ \frac{1}{2} }{ \frac{1}{2} + \frac{1}{2} }
\end{equation*}
\end{document}
